Piston-ring.



No. 879,757 PATENTED FEB. 18, 1908 H. FORD.

PISTON RING.

APPLICATION FILED JULY 16, 1906.

wins

'PIs'ron-ams.

Specification. of Letters Patent.

' Patented Feb. 18,1908.

Application filed July 16. 1906- Serial No. 3261481. V

To aLL whom it my concern:

Be it known that I, HENRY FORD, a citizen of the UnitedStates of America, residing at Detroit, in the county of Wayne and State of- Michigan, have invented certain new and useful Improvements in Piston Rings, of which the following is a specification, reference being had therein to the accompany ing drawings. i

This invention relates to improvements in packing rings for pistons, the object of the invention being to provide a packing ring which is especially adapted for use'in internal combustion engines where there is a high compression and extreme heat, the same being so constructed as to effectually prevent leakage of i the gases past the piston and prevent sticking or binding.

To this end the invention consists in forming each ring of a plurality of rings fitted together and so arranged as to give the necessary resiliency to prevent binding and at the same time will present the necessary surface to the cylinder with sufiicient pressure to ef- 5 fectually prevent leakage. And the inven' tion furtherconsists in the particular construction, arrangement and combination of parts, all as hereinafter more fully described,

reference being had to the. accompanying 3O drawing, in which Figure 1, 1s a plan view of a packing ring embodyin the invention; Fig. 2, a side ele-.

vation of t e same; Fig. 3, a side elevation of the-inner ring; and Fig. 4, a sectional view of a portion of apiston with the rings in place.-

1 represents a.piston of the ordinary construction having icircumferential groove 2 to receive the packing ring 3 which consists of an inner spht or divided ring 4 of a width oove and havin its abutting- 4 to fit in the end 5 bevele or cut at an inc ation to its edges to fit tcTgether. This inner ring is of less thickness, than the de th;of the groove and lying upon it within t "e'groove are the two outer split or divided-ringsn'which togetherare equal in width to thewidth of the inner ring and are'of lesser thickness, being just sufiiciently thick to'fill the gro ove.' The abutting ends of these outer rings are oppositely 5o notchedto form a projecting tongue 7 on each. to fit within the, notch in .the opposite end and thus in a manner interlock or lap past each other. and they are so placed in thegroove in relation to each-other and to the u inner ringas to break joints. The rings are all formed-so that. they have 1 aten'dency to spring open, as shown in Fi s.

1, 2 and 3 and when forced into a .cylin er they yieldingly push outward against its inner surface. s

The packing being yields more readily than a single ring having the same contact surfaoe, the inner heavy ring forming a ring backing for the outer light rings to ho (1 them in contact with the cylinder with sufficient force to prevent any leakage and at the same time permitting them to yield sufficiently to prevent too formed of several rings e rant onnron HENRY F ClRD, OF DETROIT, MIOHIGAN.

great friction and wear. The use of two rings i which are set so as to break joints alsoprevents leakage past the piston and these rings may be more readily removed when broken and worn than a singleheavy one and are less I eX ensive to replace. aving thus fully what I claim is:

described my invention,

1. A packing ring comprising an mner ring having oblique'overlapping ends and a pair of outer facing rings seated side by side on the inner ring each havin their ends halved and gained together, said gered in relation to each other and to the mner ring ends. g

2. Apacking ring comprising a comparatively wide inner ring of spring metal severed on .a-line obli ue" to the margins, forming overla ping en swith oblique faces, and a pair 0 facing rings of spring metal together covering the inner ring, each halvedand gained together, the joints of ,said rings beingi'n staggered relation.

I compara- .tively heavy inner expansibleringlof spring ,3. A packing ring comprising a e bottom metal adapted to completely of the conventional retainin groove of an e oblique to the margin, forming overlap ing' ends with I i 'lighter facing s of-spring metal encircling the inner ring an thing the groove, each oflthe outerrings being severed and halved tjogether to "form tenonspermanently overlapping each other and closing .in correspondmgurabbets, the

engine piston, severed on aoblique faces, and a l'pair o faces and sides of.-. the teno ns forming right angled shouldersxand the rings being assemblcd. with, their joints in staggered relatiofr. I 4; Aflpacking ring'consisting of an inner heavy ringflofspring-metal severedat one .sidedt to its edge to form f overlapping .;ends,, two ,outer rings of spring V .jmetalfof lesser-thickness than the inner ring ends being staghaving ends on the outer surface of said inner, ring yieldrings being so placed relative to each other ingly opposing the expansion of the inner as to break joints.

rim and forming the surface for the ackin In testimony whereof I aflix my signature sai outer" rin s together equalin 1n Widt in presence of two witnesses.

the Width of t e inner ring, each being sev- HENRY FORD. ered at one side'endits severed ends notched Witnesses; I

t0.form overlappingtongues adapted to en- OTTO F. BARTBIEL, gage corresponding rabbets, and all ofsaid ADOLPH BAn HnL. 

